Compressor inlet flow measuring system

Abstract

The utility model discloses a compressor inlet flow measuring system, which comprises an inlet current collector, an inlet flow sensor, a flow sensor, a flow sensor, a flow sensor, a flow sensor, a flow sensor, a flow sensor, a flow sensor, a flow sensor, a flow sensor, a flow sensor and a flow sensor, the differential pressure gauge is used for measuring the difference value between the impeller inlet pressure and the environment pressure and is communicated into the open hole through an air guide pipe; the pressure meter is used for measuring environment pressure; the thermometer is used for measuring the environment temperature; and the PLC is used for collecting instrument data and calculating the inlet flow according to the data, and is connected with the differential pressure instrument, the pressure instrument and the temperature instrument. According to the utility model, accurate data can be provided for monitoring the state of the compressor, so that the measurement accuracy of inlet flow is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a compressor inlet flow measurement system. Background Art

[0002] The flow rate change of high-speed centrifugal compressors during operation is greatly affected by environmental parameters and the compressor's own speed. During the operation of the compressor, the monitoring of the compressor status and the prevention of surge require relatively accurate flow and pressure parameters, especially the inlet flow parameters. Thanks to the development of sensor technology, the measurement accuracy of pressure parameters is already high enough, but the detection of the compressor inlet flow has always been a difficult point in compressor status monitoring and surge prevention. Utility Model Content

[0003] In order to overcome the defects of the prior art, a compressor inlet flow measurement system is provided, which can solve the problem of low detection accuracy of the existing compressor inlet flow.

[0004] In order to achieve the above technical effects, the solution provided by the utility model is to provide a kind of, which includes:

[0005] An inlet collector, the inlet collector is used to be installed at the air inlet on the front side of the compressor volute, and the side wall of the inlet collector is provided with an opening;

[0006] A differential pressure meter for measuring the difference between the impeller inlet pressure and the ambient pressure, wherein the differential pressure meter is connected to the opening through an air guide pipe;

[0007] Manometers for measuring ambient pressure;

[0008] A thermometer for measuring ambient temperature;

[0009] A PLC controller for collecting instrument data and calculating the inlet flow rate according to the data is connected with the differential pressure meter, the pressure meter and the temperature meter.

[0010] Preferably, the inlet collector includes a connecting section for connecting to the compressor volute and a horizontal section connected to the connecting section, the cross-section of the horizontal section is a circular ring, and the periphery of the horizontal section extends away from the axis to form an extension section, the horizontal section and the inner wall of the extension section form a streamlined shape, and the opening is arranged on the side wall of the horizontal section.

[0011] Preferably, the PLC controller is provided with a display screen for displaying the inlet flow data.

[0012] The beneficial effect of the utility model is that the utility model is a compressor inlet flow measurement system, the inlet collector adopts a special profile design to ensure that the inlet airflow distribution is reasonable, so as to ensure the accuracy of the pressure difference measurement. A small hole is opened on the wall of the horizontal section of the inlet collector, and the pressure difference instrument is connected to the small hole through an air duct to detect the difference between the impeller inlet pressure and the ambient pressure; the pressure meter and the temperature meter detect the ambient pressure and temperature. The data measured by the instrument is transmitted to the PLC controller, and the calculation is performed, and the calculated flow can be directly displayed on the display panel of the PLC controller. The utility model can detect the change of the dynamic pressure difference, and use the principle of dynamic and static pressure difference to calculate the flow rate of the airflow in the cross section, and then accurately calculate the current flow of the compressor according to the cross-sectional area of ​​the cross section, so as to provide accurate data for monitoring the compressor status, thereby improving the measurement accuracy of the inlet flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 The utility model is a schematic diagram of instrument connection of a compressor inlet flow measurement system.

[0015] Figure 2 It is a cross-sectional view of an inlet collector of a compressor inlet flow measurement system of the utility model.

[0016] Figure 3 The utility model is a cross-sectional view of an inlet flow collector of a compressor inlet flow measurement system installed on a compressor.

[0017] The corresponding relationship of the numbers in the figure is as follows:

[0018] 1- compressor; 2- pressure gauge; 3- differential pressure gauge; 4- temperature gauge; 5- PLC controller; 6- inlet collector; 601- connecting section; 602- horizontal section; 603- extension section; 7- air duct; 8- volute; 9- impeller. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figures 1 to 3 As shown, the embodiment of the utility model provides a compressor inlet flow measurement system, including an inlet collector 6, a differential pressure meter 3, a pressure meter 2, and a temperature meter 4. Among them:

[0021] like Figure 3 As shown, the inlet collector 6 is used to be installed at the air inlet on the front side of the volute 8 of the compressor 1, and the inlet collector 6 is coaxially arranged with the impeller 9. An opening is opened on the side wall of the inlet collector 6. The differential pressure gauge 3 is connected to the opening through the air duct 7. The differential pressure gauge 3 is used to measure the difference between the inlet pressure of the impeller 9 and the ambient pressure; the pressure gauge 2 is used to measure the ambient pressure; the temperature gauge 4 is used to measure the ambient temperature; the PLC controller 5 is connected to the differential pressure gauge 3, the pressure gauge 2 and the temperature gauge 4, and is used to collect instrument data and calculate the inlet flow rate based on the data.

[0022] Preferably, the pressure gauge 2, the differential pressure gauge 3, and the temperature gauge 4 are all high-precision detection instruments.

[0023] As a preferred implementation, Figure 2 As shown, the inlet collector 6 includes a connecting section 601 for connecting to the compressor volute 8 and a horizontal section 602 connected to the connecting section 601. The cross section of the horizontal section 602 is annular, and the periphery of the horizontal section 602 extends away from the axis to form an extension section 603, so that the inner walls of the horizontal section 602 and the extension section 603 are connected to form a streamlined shape, and the opening is provided on the side wall of the horizontal section 602. The inlet collector adopts a special profile design to ensure reasonable distribution of the inlet airflow, so as to ensure accurate pressure difference measurement.

[0024] As a preferred embodiment, the PLC controller 5 is provided with a display screen for displaying inlet flow data.

[0025] The compressor inlet flow measurement system of the utility model is provided with a small hole in the wall surface of the horizontal section 602 of the inlet collector 6, and the pressure difference instrument 3 is connected to the small hole through the air guide pipe 7 to detect the difference between the inlet pressure of the impeller 9 and the ambient pressure; the pressure instrument 2 and the temperature instrument 3 detect the ambient pressure and temperature. The data measured by the instrument is transmitted to the PLC controller 5, and the calculated flow can be directly displayed on the display panel of the PLC controller 5.

[0026] The PLC controller 5 can use the following formula for calculation. Since the inlet collector 6 is installed at the air inlet on the front side of the volute 8, the air inlet cross-sectional area A can be calculated by the formula A = (π*D 2 ) / 4, where the size of D is calculated according to Figure 2 The pressure difference value Δp detected by the pressure differential instrument 3 is used to calculate the flow velocity v of the airflow in the cross section by using the principle of dynamic and static pressure difference, and then combined with the ambient pressure and temperature according to the formula The compressor inlet flow rate Q can be calculated v , where k is a constant in the flow formula.

[0027] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A compressor inlet flow measurement system, characterized in that: include: An inlet collector, the inlet collector is used to be installed at the air inlet on the front side of the compressor volute, and a hole is opened on the side wall of the inlet collector; A differential pressure meter for measuring the difference between the impeller inlet pressure and the ambient pressure, wherein the differential pressure meter is connected to the opening through an air guide pipe; Manometers for measuring ambient pressure; A thermometer for measuring ambient temperature; A PLC controller for collecting instrument data and calculating the inlet flow rate according to the data is connected to the differential pressure meter, the pressure meter and the temperature meter.

2. The compressor inlet flow measurement system according to claim 1, characterized in that: The inlet collector includes a connecting section for connecting to the compressor volute and a horizontal section connected to the connecting section. The cross-section of the horizontal section is a circular ring, and the periphery of the horizontal section extends away from the axis to form an extension section. The horizontal section and the inner wall of the extension section form a streamlined shape, and the opening is arranged on the side wall of the horizontal section.

3. The compressor inlet flow measurement system according to claim 1, characterized in that: The PLC controller is provided with a display screen for displaying the inlet flow data.

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